One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,10)(7,8)(13,14,16,18)(15,17,19,20)(22,25)(23,27)(5,6)(7,11)(8,12)(9,10)(13,15,16,19)(14,17,18,20)(23,27)(26,28)(5,7,9,8)(6,11,10,12)(13,15)(14,17)(16,19)(18,20)(21,22,24,25)(23,26,27,28)(1,2)(3,4)(5,8,9,7)(6,11,10,12)(21,23)(22,26)(24,27)(25,28)(5,6)(7,12)(8,11)(9,10)(13,14)(15,17)(16,18)(19,20) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.